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Top 25 SAP HANA Most Popular Interview Questions

Answer:

• SAP HANA stands for High Performance Analytical Appliance- in-memory computing engine. HANA is linked to ERP systems; Frontend modeling studio can be used for replication server management and load control.

Question: 1 What is SAP HANA?

Answer:

• SAP HANA has an in-memory computing engine and access the data straightaway without any backup. To avoid the risk of losing data in case of hardware failure or power cutoff, persistence layer comes as a savior and stores all the data in the hard drive which is not volatile.

Question: 2 What is the role of the persistence layer in SAP HANA?

Answer:

• Platform Edition: Platform edition is intended for customers who want to use ETL-based replication and already have a license for SAP BO Data Services.

• Enterprise Edition: Enterprise edition is intended for customers who want to use either trigger-based replication or ETL-based replication and do not already have all of the necessary licenses for SAP BO Data Services.

Question: 3What are the different editions available in HANA appliance software?

Answer:Modeling studio in HANA performs multiple task like

Declares which tables are stored in HANA, first part is to get the meta-data and then schedule data replication jobs.

Manage Data Services to enter the data from SAP Business Warehouse and other systems.

Manage ERP instances connection, the current release does not support connecting to several ERP instances.

Use data services for the modeling.

Do modeling in HANA itself.

essential licenses for SAP BO data services.

Question: 5 What is modeling studio?

Answer:

• A database table contains data in the form of rows and columns. However Computer memory is organized as a linear structure. To store a table in linear memory, there are two options. A row-based storage stores a table as a sequence of records, each of which contains the fields of one row. In a columnar storage the entries of a column are stored in contiguous memory locations. The SAP HANA database allows specifying whether a table is to be stored column-wise or row-wise. It is also possible to alter an existing table from columnar to row-based and vice versa. Search operations in tabular data can be accelerated by organizing data in columns instead in rows.

Question: 5 What is columnar and Row-Based Data Storage?

Answer:

• There are three different compression techniques

• Run-length encoding

• Cluster encoding

• Dictionary encoding

Question: 6what are the different compression techniques?

Answer:

• Calculations are typically executed on single or a few columns only.

• The table is searched based on values of a few columns.

• The table has a large number of columns.

• The table has a large number of rows and columnar operations are required (aggregate, scan, etc.).

• High compression rates can be achieved because the majority of the columns contain only few distinct values (compared to number of rows).

Question: 7 What are the advantages of Column based tables?Answer:

Answer:

• SAP SLT works on trigger based approach; such approach has no measurable performance impact in the source system.

• It offers filtering capability and transformation.

• It enables real-time data replication, replicating only related data into HANA from non-SAP and SAP source systems.

• It is fully integrated with HANA studios.

• Replication from several source systems to one HANA system is allowed, also from one source system to multiple HANA systems is allowed.

Question: 8Mention what is the advantage of SLT replication?

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